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Service Manual
Microwave Oven
Model: KOR-616T2S
KOR-816T2S
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the
magnetron or other microwave source, and make repairs as necessary: (1) Interlock
operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other
damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or
abuse.
(c) Before turning on microwave power for any service test or inspection within the micro-
wave generating compartments, check the magnetron, wave guide or transmission line,
and cavity for proper alignment, intergrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and
microwave generation and transmission systems shall be repaired, replaced, or
adjusted by procedures described in this manual before the oven is released to the
owner.
(e) A microwave leakage check to verify compliance with the Federal performance
standard should be performed on each oven prior to release to the owner.
TABLE OF CONTENTS
PROPER USE AND SERVICE PRECAUTIONS ....................................................................................................2
SPECIFICATIONS ...................................................................................................................................................3
FEATURE DIAGRAM...............................................................................................................................................4
EARTHING INSTRUCTIONS ..................................................................................................................................5
INSTALLATION ........................................................................................................................................................5
OPERATION PROCEDURES .................................................................................................................................6
CONTROLS .............................................................................................................................................................7
INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS........................................................................17
MEASUREMENT OF THE MICROWAVE OUTPUT POWER..............................................................................19
MICROWAVE RADIATION TEST..........................................................................................................................20
WIRING DIAGRAM................................................................................................................................................21
CIRCULT DESCRIPTION ......................................................................................................................................23
SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR ...........................................................................26
DISASSEMBLY AND ASSEMBLY.........................................................................................................................27
TROUBLE SHOOTING GUIDE .............................................................................................................................32
COMPONENT TEST PROCEDURE.....................................................................................................................37
SAFETY INTERLOCK CONTINUITY TEST .........................................................................................................38
PRINTED WIRING BOARD...................................................................................................................................39
CIRCUIT CHECK PROCEDURE .....................................................................................................................39
P.C.B. CIRCUITS DIAGRAM............................................................................................................................45
PRINTED CIRCUITS BOARD..........................................................................................................................47
P.C.B. LOCATION NO ......................................................................................................................................49
EXPLODED AND PARTS LIST .............................................................................................................................51
1
CAUTION: This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the
Service Manual for Proper Service Procedures to Assure Continued Safety operation and
for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.
PROPER USE AND SERVICE PRECAUTIONS
1. For Safe Operation
Damage that allows the microwave energy(that cooks or heats the food) to escape will result in poor
cooking and may cause serious bodily injury to the operator.
IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE
APPLIANCE.
(Only a trained service personnel should make repairs.)
1) A broken door hinge.
2) A broken door viewing screen.
3) A broken front panel, oven cavity.
4) A loosened door lock.
5) A broken door lock.
The door gasket plate and oven cavity surface should be kept clean.
No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven.
DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave
oven has concealed switches to make sure the power is turned off when the door is opened.
Do not attempt to defeat them.
DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE
MANUAL.
2. For Safe Service Procedures.
1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to
servicing the oven.
2) If any certified oven unit is found to have excessive emission level 5mW/cm 2, the service
person should:
(a) inform the manufacturer, importer or assembler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the
oven and contact the manufacturer and CDRH immediately.
2
SPECIFICATIONS
Specifications KOR-816T2S KOR-616T2S
Power Supply 230V ~ 50Hz, SINGLE PHASE WITH EARTHING
POWER CONSUMPTION 1350 W 1200 W
MICROWAVE OUTPUT POWER 900 W (IEC 705) 800 W (IEC 705)
FREQUENCY 2450 MHz
OUTSIDE DIMENSIONS (W x H x D) 495 x 289 x 409 mm 465 x 274 x 379 mm
CAVITY DIMENSIONS (W x H x D) 320x 225 x 330 mm 290x 200 x 290 mm
NET WEIGHT APPROX. 15.0Kg APPROX. 13.5Kg
TIMER 60 min. 00 sec
POWER SELECTIONS 5 LEVELS
* Specifications subject to change without notice.
495 409
(465) (379)
Stop Defrost
1 2 Quantity Weight Time
Lock Auto cook Watt g
Power Defrost +1min
Auto Cook
1. Beveroge
2. Soup
(274)
3. Casserole
4. Vegetable
289
5. Fish Fillets
STOP START
More CLEAR Speedy
y
t
r/Weight/Quanti
Less
ime
Clock T
( ) : For KOR-616T
3
FEATURES DIAGRAM
1 2 3 4 5
Stop Defrost
1 2 Quantity Weight Time
9
Stop Defrost
1 2 Quantity Weight Time
Lock Auto cook Watt g
Lock Auto cook Watt g
Power Defrost +1min
Power Defrost +1min
Auto Cook
1. Beveroge
2. Soup
3. Casserole
4. Vegetable
0 w
5. Fish Fillets
STOP START
q Auto Cook
More CLEAR Speedy
1. Beveroge
y 2. Soup
e
t
r/Weight/Quanti
Less 3. Casserole
4. Vegetable
ime
Clock T 5. Fish Fillets
STOP START
t r
More CLEAR Speedy
y
6 y
t
r/Weight/Quanti
7 Less
u p
ime
Clock T o
i
8
1 Door latch - When the door is closed it will automatically lock shut. If the door is opened while the
oven is operating, magnetron will immediately stop operating.
2 Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave
leakage.
3 Oven cavity.
4 Spatter shield - Protects the microwave outlet from splashes of cooking foods.
5 Safety interlock system.
6 Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through,
but not the microwaves.
7 Glass cooking tray - Made of special heat resistant glass. Food in a proper receptacle is placed on
this tray for cooking.
8 Roller guide - This must always be used for cooking together with the glass cooking tray.
9 Display - Cooking time, power level, present time are displayed.
0 q e Function buttons - Used to select desired oven operation.
: MICROWAVE, DEFROST, AUTOCOOK.
w +1 min. button - Used to increase time of operating.
r Start button - Used to start a selected operation. When lamp blinks, press the start button.
Speedy cook button - Used to set desired time.(It is incresed 30 seconds.)
t Stop/clear button - Used to pause or clear all information manually put into the oven control panel
except clock.
y u More/Less button - Used to select auto cook time. (More/less 10% of auto cook time)
i Clock button - Used to set and recall the time of day.
o Dial knob - Used to set the cooking time, weight and quantity.
p Guide lamp - When blinking it informs you to be ready to operte dial knob.
4
EARTHING INSTRUCTIONS
This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of
electric shock by providing an escape, wire for the electric current. This appliance is equipped with a cord
having a earthing wire with a earthing plug. The plug must be plugged into an outlet that is properly
installed and earthed.
WARNING: Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified
electrician or serviceman if the earthing instructions are not completely understood, or if
doubt exists as to whether the appliance is properly earthed. If it necessary to use an
extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a 3-
slot receptacle that will accept the plug on the appliance. The marked rating of the
extension cord should be equal to or greater than the electrical rating of the appliance.
INSTALLATION
Steady, flat location.
1 This oven should be set on a steady, flat surface.
This oven is designed for counter top use only.
2 Leave space behind and side.
All air vents should be kept a clearance. If all vents are covered during operation, the oven may
overheat and, eventually, oven failure.
Away from Radio, and TV sets
3 Poor television reception and radio interference may result if the oven is located close to a TV, Radio,
or antenna, feeder and so on.
Position the oven as far from them as possible.
Away from heating appliances and water taps
4 Keep the oven away from hot air, steam or splash when choosing a place to position it, or the
insulation might be adversely affected and breakdowns occur.
Power supply
5